Dell OpenManage Server Administrator Version 6.5 Manual de usuario descargar pdf (Pagina 72)

Manage Physical Disk Power

Does my controller support this feature? See Supported Features.

The Manage Physical Disk Power task allows you to manage the power consumed by the physical disks by spinning down the hot spares and unconfigured

disks. This option is provided only with PERC H700 and PERC H800 controllers with the firmware version 7.1 and above.

The following table displays the properties in the Manage Physical Disk Power option:

Table 6-8. Manage Physical Disk Power Properties

To manage physical disk power:

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1. Select Enabled for the Spin Down Unconfigured Drives and Spin Down Hot Spares options.

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2. Click Apply Changes. To exit and cancel your changes, click Go Back to Previous Page.

To locate this task in Storage Management:

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1. Expand the Storage tree object to display the controller objects.

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2. Select a controller object.

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3. Select the Information/Configuration subtab.

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4. Select Manage Physical Disk Power from the Available Tasks drop-down menu.

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5. Click Execute.

Manage Preserved Cache

The Managed Preserved Cache feature provides you the option to ignore or restore the controller cache data.

In the write-back policy, data is written to the cache before being written to the physical disk. If the virtual disk goes offline or is deleted for any reason, the

data in the cache is lost.

Data in the cache may also be lost in case of unintended cable or power failure. In the event of such a failure, Storage Management preserves the data

written on the preserved or dirty cache until you recover the virtual disk or clear the cache.

This feature is available only on SAS controllers with firmware version 6.1 and later.

The status of the controller is affected by the preserved cache. The controller status is displayed as degraded if the controller has preserved cache.

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Manage Preserved Cache

You can discard the preserved cache only if all of the following conditions are met:

l The controller does not have any foreign configuration. Select Click for Preview to view details of the foreign configuration. See Foreign Configuration

Operations.

l The controller does not have any offline or missing virtual disks. If there are offline or missing virtual disks, ensure you have a backup of these virtual

disks.

l Cables to any virtual disk are not disconnected.

Manage Encryption Key

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Property

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Definition

Spin Down Unconfigured

Drives

The Enabled option spins down the unconfigured disks if they are unattended for a specified interval of time.

Spin Down Hot Spares

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The Enabled option spins down the hot spares if no read-write operation takes place on the hot spare in a specified interval

of time.

Time Interval for Spin Down

This property sets the time interval after which the hot spares and unconfigured drives spins down.

CAUTION: You may not be able to use Storage Management to manage the preserved cache in some cases. As an example, consider you have a

RAID 1 level with two disks—D1 and D2. If you now remove D2, the virtual disk is degraded and the data in the controller cache is written to D1.

At this point, D1 has the latest data. Now, if you re-insert D2 and pull out D1, the virtual disk is still be degraded and does not have the latest

data.

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Dell OpenManage Server Administrator Version 6.5 Manual de usuario Pagina 72

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